Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime

作     者：Hangyong Shan Ying Yu Xingli Wang Yang Luo Shuai Zu Bowen Du Tianyang Han Bowen Li Yu Li Jiarui Wu Feng Lin Kebin Shi Beng Kang Tay Zheng Liu Xing Zhu Zheyu Fang 

作者机构：School of PhysicsState Key Lab for Mesoscopic Physics/Academy for Advanced Interdisciplinary Studies/Collaborative Innovation Center of Quantum MatterPeking University100871 BeijingChina CNRS International-NTU-Thales Research Alliance(CINTRA)Nanyang Technological UniversitySingapore 637553Singapore Centre for Micro-/Nano-Electronics(NOVITAS)School of Electrical and Electronic Engineering/Centre for Programmed MaterialsSchool of Materials Science and EngineeringNanyang Technological UniversitySingapore 637553Singapore 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2019年第8卷第1期

页      面：1099-1107页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：supported by the National Key Research and Development Program of China(Grant No.2017YFA0205700) National Basic Research Program of China(Grant Nos.2015CB932403,2017YFA0206000) National Science Foundation of China(Grant Nos.11674012,61422501,11374023,61521004 and 21790364) Beijing Natural Science Foundation(Grant No.L140007) Foundation for the Author of National Excellent Doctoral Dissertation of PR China(Grant No.201420) National Program for Support of Top-notch Young Professionals(Grant No.W02070003) Ministry of Education Singapore under Grant No.MOE2015-T2-2-043 

主　　题：properties coupling transfer 

摘      要：Achieving strong coupling between plasmonic oscillators can significantly modulate their intrinsic optical ***,we report the direct observation of ultrafast plasmonic hot electron transfer from an Au grating array to an MoS_(2) monolayer in the strong coupling regime between localized surface plasmons(LSPs)and surface plasmon polaritons(SPPs).By means of femtosecond pump-probe spectroscopy,the measured hot electron transfer time is approximately 40 fs with a maximum external quantum yield of 1.65%.Our results suggest that strong coupling between LSPs and SPPs has synergetic effects on the generation of plasmonic hot carriers,where SPPs with a unique nonradiative feature can act as an‘energy recycle bin’to reuse the radiative energy of LSPs and contribute to hot carrier *** energy exchange between plasmonic modes in the strong coupling regime can further enhance the vertical electric field and promote the transfer of hot electrons between the Au grating and the MoS_(2) *** proposed plasmonic strong coupling configuration overcomes the challenge associated with utilizing hot carriers and is instructive in terms of improving the performance of plasmonic opto-electronic devices.